Grate



Oct. 5 1926.

J. J. FITZGERALD VGRATE Filed OC'b. 24, 1924 no @ZV/n [771,671 of 'f' 594% 17 fvg y MMM@ Patented Uct. 5, 1926.

JOHN J'. FITZGERALD, OF EVERETT, MASSACHUSETTS.

GBATE.

Application filed. October 24, 1924. Serial No. 745,611.V

r1`his invention relates to improvements in grates for steam boilers, object to provide a grate o mentioned and constructed in that portions thereof which and has for its f the character such a manner are located jacent to the walls of the fire-pot and which are so exposed to heat that they require more frequent replacement than other portions of said grate, may ly removed interfere in any way be easily and quickwithout it being necessary to with the pivoted grate bars andv the `dumping mechanism of the manner to allow is still further an object of the invenmember of the the grate by detachably said member to the frame of said said member to without disturbing the masonry r even drawing provided with aperturesertending therethrough that will allow a circulation of air from beneath the grate through said member.

rfhe invention consists in the combination and arrangement of parts set forth in the following s ecilication and particularly as pointed out in the claims thereof.

Referring to the drawings Figure 1 represents a sect ional plan View through the walls of the fire-pot of a steam boiler. a grate embodying my invention being illustrated in position a with.

ssociated there- Fig. 2 is an enlarged detail vertical section taken on the line 2-2 of Fig. 1.

Fig. 3 is an enlarged detail vertical section taken on the line 3-3 of Fig. 1.

F10'. 4 is an enlarged detail vertical section taken on theline 4-4 of Fig. 1.

Like numerals refer to like parts throughout the several views of the drawings.

ln the drawings, 5 represents the walls of an ash pit and fire-pot of and 6 represents the frames a steam boiler, of a grate, said.

frames being supported in any suitable manner upon the walls 5. The frames 6 of this invention preferably have a dead plate member 7 detachably secured thereto at the front thereof, said member having a dovetail shaped portion 8 formed integral therewith, which interlocks with a similarly shaped recess provided in the frame 6. The

dead plate member 7 constitutes the bottom member of a fuel inlet posite sides of said member passage 9, and the opare located ad- Vshake or'dnmg the ashes.

jacent to the side walls of said inlet passage, and rest upon the masonry at the front of the boiler. rihe dead plate member 7 also has a plurality of holes 10 extending therethrough, thereby making it possible for air within the ash pit and beneath the grate to pass upwardly therethrough, the resulting circulation of air tending to reduce the temperature of the dead plate member and preventing the latter from warping and becoming distorted.

Pivotally mounted upon each frame 6 are a plurality of grate bais 11, the latter being provided at each l 12 which rests in a socket 13 provided in the frame '6. rEhe grate bars 11 are old and well known in the art, and are operatively connected with a suitable mechanism by which they are tipped when it is desired' to This dumping mechanism, however, forms no part of this invention and is not illustrated in the drawings.

Each grate bar 11 embodies therein longitudinallyl extending side portions 14 and transversely extending cross bars 15 between which are spaces 16, and extending outwardly from the side portions 14 are lingers 17, between which are located spaces 18, and said fingers and spaces align with the cross bars 15 and spaces 16 respectively.

Located at the front and rear of each frame 6 between the'inner surface of said frame and the adjacent grate bar 11 narrow spaces are provided in which finger bars 19 are located, the latter `being loosely mounted on said frame. Each finger bar 19 embodies therein a longitudinally extending portion 20 having a plurality of fingers 21 ext-ending transversely therefrom at one side thereof, and between .said fingers spaces 22 are provided. The fingers 21 andspaces 22 align with the fingers 17 and spaces 18 of the grate bars 11. Each finger bar 19 has a pair of lugs 23 provided at each end thereof which rest loosely in sockets 24 provided in the frame 6', and said finger bars 19 may be lifted from the sockets 24 at any time that it is desired to replace a warped or burned out linger bar with a new bar.

Located at the outer side of each frame 6, and between said frame and the inner side wall of the fire-pot is a narrow space in which another finger bar 25 is located, said finger bar being provided with rectangular end thereof with a trunnion lugs 26 which rest loosely in sockets 2T provided in the frame 6, and said finger bars 25 embody therein a longitudinally extending side portion Q8 from which a plurality of lingers 29 project transversely toward Vthe adjacent grate bars ll. The lingers 29 have spaces 30 -formed therebetween. y The finger bar 25 may be quickly removed from the frame 6 in the same manner as are the finger bars 19 at such times as it is necessary to replace said bar. y

It will be noted that the linger bars 19 and 25 extend entirely around the grate within the fire-pot of the boiler and are located ad jacent to the inner walls of said fire-pot and each or' said ringer bars may be easily and quickly replaced without in any way disturbing the grate bars ll.

It will also be noted that the linger bars 19 and 25, and particularly the former are relatively smaller than the gate bars ll, and are, therefore, much cheaper to construct. lt will, therefore7 be seen that with a grate constructed as herein illustrated and described, it is often possible to practically renew the grate by simply replacing certain of the finger bars and dead plate member 7 that have become warped from the intense heat without it being necessary to disturb any of the grate bars, suoli as has vtormerly been necessary, the result being that the grate can be practically renewed at a much smaller cost than has formerly been possible.

yBy detachably securing the dead plate member 7 to the frame 6 of the grate, it is possible to quickly replace said member at any tinie, Without in any way disturbing the masonry at the front of the boiler, or without it'beingnecessary to shut down the boiler and draw the fire as has formerly been the case.

I claim:

l. A grate comprising, in combination, a four-sided rectangular frame having two end portions extended beyond one of the side portions, a plurality or' Grate bars pivotally mounted upon said frame, and another grate bar loosely mounted upon said frame and positioned upon an outer side thereofand between the extended portions thereof.

2. A grate comprising, in combination, a four-sided rectangular frame having two end portions extended beyond one of the side portions, a plurality of grate bars pivotally mounted upon said frame, a plurality of other grate bars loosely mounted upon said traine between said pivoted grate bars and the end portions or" said frame, and another grate bar also loosely mounted upon said trame and positioned upon an out-er side thereof and between the extended portions thereof.

ln testimony whereofI I have hereunto set niy hand.

JOHN J .v FITZGERALD. 

